CN114826394A - High-precision large-dynamic-range optical channel attenuation detection system and method - Google Patents
High-precision large-dynamic-range optical channel attenuation detection system and method Download PDFInfo
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- CN114826394A CN114826394A CN202210423981.5A CN202210423981A CN114826394A CN 114826394 A CN114826394 A CN 114826394A CN 202210423981 A CN202210423981 A CN 202210423981A CN 114826394 A CN114826394 A CN 114826394A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
Abstract
The invention discloses a high-precision large-dynamic-range optical channel attenuation detection system and a method, which comprises the following steps: selecting and starting a laser with a corresponding wavelength in the multi-wavelength laser group according to the characteristics of a channel to be measured, and generating and transmitting a light signal; directly accessing the optical signal to a photoelectric detector to obtain first optical power of the optical signal; the optical signal is accessed to an optical channel to be measured, and then is accessed to the photoelectric detector after being transmitted by the optical channel, so that second optical power of the optical signal after being transmitted by the optical channel is obtained; and obtaining the attenuation result of the optical channel to be measured by making a difference value between the first optical power and the second optical power. The detection system of the invention does not receive the influence of the nonlinearity of the device itself, and detects the attenuation value of the optical channel by measuring the change of the optical power before and after the access of the channel. The method and the device realize rapid detection when different optical powers are input, improve the detection capability of the optical power, strengthen the adaptability to different optical powers and ensure the measurement accuracy.
Description
Technical Field
The invention belongs to the field of laser communication, and particularly relates to a high-precision large-dynamic-range optical channel attenuation detection system and method.
Background
Compared with radio frequency communication, the wireless optical communication has the obvious advantages of wide frequency band, low cost, quick deployment, no need of spectrum license and the like, has huge application potential, and is a research hotspot and frontier in the field of domestic and foreign communication at present. Laser transmission in a wireless channel is susceptible to atmospheric turbulence, so that the wavefront phase changes, and the stability and reliability of a communication link are reduced. At present, the understanding of wireless optical communication channels in China is still incomplete, no relevant standards for testing parameters of the wireless optical communication channels exist, and no standard which can be referred to for testing a certain effect exists. Therefore, the wireless optical communication terminal based on various bearing platforms has not been implemented with large-scale engineering application. The wireless optical channel characteristic test and analysis research can be used for guiding the development of wireless optical communication system equipment, the research level of the wireless optical communication equipment is improved and guaranteed, the unified wireless optical channel test standard can be formulated, the reference is provided for the use environment of the wireless optical communication equipment, and the long-term development requirement of the wireless optical communication equipment can be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-precision large-dynamic-range optical channel attenuation detection method, which is used for realizing a measurement system for optical channel attenuation values with different characteristics. Calculating channel attenuation by using the difference value of optical power before and after channel transmission, namely selecting and starting a group of lasers in the multi-wavelength laser group through channel characteristics and measuring the optical power of the lasers; and then, accessing the laser to a channel, and measuring the optical power transmitted by the channel, so as to make a difference between the optical powers obtained twice and obtain an attenuation value of the channel.
In order to achieve the purpose, the invention provides the following scheme: a high-precision, large-dynamic-range optical channel attenuation detection system, comprising:
the device comprises a first optical power acquisition module, a second optical power acquisition module and an optical power attenuation detection module;
the first optical power acquisition module is used for acquiring first optical power of an optical signal;
the second optical power obtaining module is configured to obtain a second optical power of the optical signal;
the optical power attenuation detection module is respectively connected with the first optical power acquisition module and the second optical power acquisition module, and is configured to perform a difference on the first optical power and the second optical power to obtain an attenuation result.
Preferably, the first optical power obtaining module includes a multi-wavelength laser group, an optical channel transmission unit, and a photodetector;
the multi-wavelength laser group is used for generating and transmitting optical signals;
the optical channel transmission unit is used for receiving the optical signal and outputting the optical signal to the photoelectric detector through an optical channel;
the photodetector is connected to the optical channel transmission unit, and is configured to receive the optical signal output by the optical channel transmission unit, and obtain a first optical power of the optical signal.
Preferably, the second optical power obtaining module comprises a multi-wavelength laser group and a photoelectric detector;
the multi-wavelength laser group is used for generating and transmitting optical signals;
the photoelectric detector is connected with the multi-wavelength laser group and used for receiving the optical signals output by the multi-wavelength laser group and obtaining second optical power of the optical signals.
Preferably, the multi-wavelength laser group includes a plurality of lasers corresponding to different wavelengths, and is configured to selectively turn on the lasers corresponding to the wavelengths in the multi-wavelength laser group according to different requirements of different optical channels on the transmission optical wavelength, and generate and transmit optical signals.
Preferably, the optical channel attenuation detection system further comprises a photocurrent acquisition module, a signal processing module and a bias voltage adaptive adjustment module;
the photoelectric current acquisition module is connected with the photoelectric detector and used for acquiring photoelectric current generated after the photoelectric detector receives a light signal and transmitting the photoelectric current to the signal processing module;
the signal processing module is connected with the photocurrent acquisition module and used for receiving the photocurrent and sending different instructions to the bias voltage self-adaptive adjustment module according to the magnitude of the photocurrent;
the bias voltage self-adaptive adjusting module is connected with the signal processing module and used for adjusting the bias voltage of the photoelectric detector according to different instructions sent by the signal processing module.
Preferably, the signal processing module includes a signal intensity determining unit, and the signal intensity determining unit is configured to control the bias voltage adaptive module to output a high-voltage gate control signal by setting a signal intensity threshold value, so that the photodetector operates in a single photon counting mode to perform low-power optical signal detection when the signal received by the signal processing module is smaller than the signal intensity threshold value; when the signal received by the signal processing module is greater than the signal intensity threshold, the bias voltage self-adaptive module is controlled to output a direct current bias signal, so that the photoelectric detector works in a linear mode to detect a strong-power optical signal.
A high-precision large-dynamic-range optical channel attenuation detection method comprises,
selecting and starting a laser with a corresponding wavelength in the multi-wavelength laser group according to the characteristics of a channel to be measured, and generating and transmitting a light signal;
directly accessing the optical signal to a photoelectric detector to obtain first optical power of the optical signal; the optical signal is accessed to an optical channel to be measured, and then is accessed to a photoelectric detector after being transmitted by the optical channel, so that second optical power of the optical signal after being transmitted by the optical channel is obtained;
and obtaining the attenuation result of the optical channel to be measured by making a difference value between the first optical power and the second optical power.
Preferably, in the process of accessing the optical signal to the optical channel to be measured, and accessing the optical signal to the photodetector after transmission of the optical channel to obtain the second optical power of the optical signal after transmission of the optical channel, the method further includes transmitting a photocurrent generated after the photodetector receives the optical signal to the signal processing module through the photocurrent acquisition module, and the signal processing module sends different instructions to the bias voltage adaptive module to adjust the bias voltage of the photodetector according to the magnitude of the received photocurrent.
Preferably, the process that the signal processing module sends different instructions to the bias voltage adaptive module to adjust the bias voltage of the photodetector according to the magnitude of the received photocurrent includes setting a signal intensity threshold by a signal intensity judgment unit of the signal processing module, and controlling the bias voltage adaptive module to output a high-voltage gate control signal when a signal received by the signal processing module is smaller than the signal intensity threshold, so that the photodetector operates in a single photon counting mode to perform weak-power optical signal detection; when the signal received by the signal processing module is greater than the signal intensity threshold, the bias voltage self-adaptive module is controlled to output a direct current bias signal, so that the photoelectric detector works in a linear mode to detect a strong-power optical signal.
The invention discloses the following technical effects:
the invention provides a high-precision large-dynamic-range optical channel attenuation detection system and a method, wherein the large-dynamic-range optical channel attenuation detection system is formed by optical and electronic devices such as a laser, a photoelectric detector, a bias voltage control module, a photocurrent acquisition module, a signal processor and the like; and obtaining the attenuation value of the current optical channel by measuring the difference value of the optical power of the non-accessed optical channel and the accessed optical channel. In the optical power detection process, after the collected photocurrent is calculated by the signal processing module, the bias voltage of the photoelectric detector is intelligently controlled so as to achieve the effect of large-range detection of the optical power. In the invention, the detection of the optical channel attenuation in multiple situations and the complementary correction of the detection performance of the photoelectric detector are realized by introducing a multi-wavelength laser group consisting of lasers with different wavelengths.
The high-precision large-dynamic-range optical channel attenuation measuring system realized by the invention is not influenced by the nonlinearity of the device; the attenuation value of the optical channel is detected by measuring the variation of the optical power before and after the access channel. The invention provides a method for adjusting the bias voltage of a photoelectric detector by adopting a bias voltage self-adaptive adjusting module, thereby realizing the rapid detection of the input of different optical powers, improving the detection capability of the optical power, strengthening the adaptability to different optical powers and ensuring the measurement accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a high-precision large-dynamic-range optical channel attenuation detection system, which comprises:
the method comprises the following steps: the device comprises a first optical power acquisition module, a second optical power acquisition module and an optical power attenuation detection module;
the first optical power acquisition module is used for acquiring first optical power of an optical signal;
the second optical power obtaining module is configured to obtain a second optical power of the optical signal;
and the optical power attenuation detection module is respectively connected with the first optical power acquisition module and the second optical power acquisition module and is used for making a difference value between the first optical power and the second optical power to obtain an attenuation result.
The first optical power acquisition module comprises a multi-wavelength laser group, an optical channel transmission unit and a photoelectric detector;
the multi-wavelength laser group is used for generating and transmitting optical signals;
the optical channel transmission unit is used for receiving the optical signal and outputting the optical signal to the photoelectric detector through an optical channel;
the photodetector is connected to the optical channel transmission unit, and is configured to receive the optical signal output by the optical channel transmission unit, and obtain a first optical power of the optical signal.
The second optical power acquisition module comprises a multi-wavelength laser group and a photoelectric detector;
the multi-wavelength laser group is used for generating and transmitting optical signals;
the photoelectric detector is connected with the multi-wavelength laser group and used for receiving the optical signals output by the multi-wavelength laser group and obtaining second optical power of the optical signals.
The multi-wavelength laser group comprises a plurality of lasers corresponding to different wavelengths and is used for selectively starting the lasers corresponding to the wavelengths in the multi-wavelength laser group according to different requirements of different optical channels on transmission optical wavelengths to generate and transmit optical signals.
The optical channel attenuation detection system also comprises a photocurrent acquisition module, a signal processing module and a bias voltage self-adaptive adjustment module;
the photoelectric current acquisition module is connected with the photoelectric detector and used for acquiring photoelectric current generated after the photoelectric detector receives a light signal and transmitting the photoelectric current to the signal processing module;
the signal processing module is connected with the photocurrent acquisition module and used for receiving the photocurrent and sending different instructions to the bias voltage self-adaptive adjustment module according to the magnitude of the photocurrent;
the bias voltage self-adaptive adjusting module is connected with the signal processing module and used for adjusting the bias voltage of the photoelectric detector according to different instructions sent by the signal processing module.
The signal processing module comprises a signal intensity judging unit, and the signal intensity judging unit is used for controlling the bias voltage self-adaptive module to output a high-voltage gating signal by setting a signal intensity threshold value when a signal received by the signal processing module is smaller than the signal intensity threshold value, so that the photoelectric detector works in a single photon counting mode to detect a light signal with weak power; when the signal received by the signal processing module is greater than the signal intensity threshold, the bias voltage self-adaptive module is controlled to output a direct current bias signal, so that the photoelectric detector works in a linear mode to detect a strong-power optical signal.
As shown in fig. 1, the method for detecting attenuation of an optical channel with high precision and large dynamic range provided by the present invention includes:
selecting and starting a laser with a corresponding wavelength in the multi-wavelength laser group according to the characteristics of a channel to be measured, and generating and transmitting a light signal;
directly accessing the optical signal to a photoelectric detector to obtain first optical power of the optical signal; the optical signal is accessed to an optical channel to be measured, and then is accessed to a photoelectric detector after being transmitted by the optical channel, so that second optical power of the optical signal after being transmitted by the optical channel is obtained;
and obtaining the attenuation result of the optical channel to be measured by making a difference value between the first optical power and the second optical power.
The method comprises the steps that an optical signal is connected to an optical channel to be measured, the optical signal is connected to a photoelectric detector after being transmitted through the optical channel, and in the process of obtaining a second optical power of the optical signal transmitted through the optical channel, the photoelectric signal generated after the photoelectric detector receives the optical signal is transmitted to a signal processing module through a photoelectric current collecting module, and the signal processing module sends different instructions to a bias voltage self-adaptive module according to the size of the received photoelectric current to adjust the bias voltage of the photoelectric detector.
The process that the signal processing module sends different instructions to the bias voltage self-adaptive module to adjust the bias voltage of the photoelectric detector according to the magnitude of received light current comprises the steps that a signal intensity threshold value is set through a signal intensity judging unit of the signal processing module, and when a signal received by the signal processing module is smaller than the signal intensity threshold value, the bias voltage self-adaptive module is controlled to output a high-voltage gate control signal, so that the photoelectric detector works in a single photon counting mode to detect light signals with weak power; when the signal received by the signal processing module is greater than the signal intensity threshold, the bias voltage self-adaptive module is controlled to output a direct current bias signal, so that the photoelectric detector works in a linear mode to detect a strong-power optical signal.
Example one
The invention provides a high-precision large-dynamic-range optical channel attenuation detection system, which comprises the following optical and electronic devices: the device comprises a multi-wavelength laser group, a photoelectric detector, a photocurrent acquisition module, a signal processing module and a bias voltage self-adaptive adjustment module; the optical and electronic devices are utilized to form a large dynamic range optical power detection system, and channel attenuation is measured after a channel is accessed.
Meanwhile, as shown in fig. 1, the present invention further provides a specific detection method using the above high-precision large-dynamic-range optical channel attenuation detection system, which specifically includes the following steps:
the method comprises the following steps: selecting a multi-wavelength laser group to be started according to the characteristics of a channel to be measured, and directly connecting the output of a laser to a photoelectric detector to obtain the output light power;
step two: directly accessing the laser output by the first step into an optical channel to be measured, and accessing the laser into a photoelectric detector after the laser is transmitted by the optical channel to obtain the optical power transmitted by the channel;
further, the second step specifically includes, according to different requirements of different optical channels on the transmission optical wavelength, selectively turning on a laser with a corresponding wavelength in the multi-wavelength laser group, and outputting an optical signal generated by the laser to the photodetector through an optical channel to be tested; the photoelectric detector receives the light signal and then generates a photocurrent which is transmitted to the signal processing module through the photocurrent acquisition module, and the signal processing module sends different instructions to the bias voltage self-adaptive module according to the magnitude of the received photocurrent so as to change the bias voltage of the photoelectric detector. When the signal received by the signal processing module is very weak, the bias voltage self-adaptive module outputs a high-voltage gating signal, so that the photoelectric detector works in a single photon counting mode to detect an optical signal with extremely weak power; when the signal processing module receives a strong signal, the bias voltage self-adaptive module outputs a direct current bias signal, so that the photoelectric detector works in a linear mode to detect a strong-power optical signal. The bias voltage self-adaptive module realizes wide-range detection of received optical power and realizes the effect of protecting the photoelectric detector by self-adaptive control of the bias voltage of the photoelectric detector.
Step three: and D, obtaining the attenuation value of the current measuring optical channel by making a difference value between the optical powers measured in the first step and the second step.
In summary, the present invention detects the attenuation value of the optical channel by measuring the variation of the optical power before and after accessing the channel. The system can realize the optical power measurement in a large dynamic range, can meet the requirements of high-precision large dynamic range optical channel attenuation detection, and can complement the results after respective test by using a multi-wavelength laser to eliminate the nonlinear influence of devices, so that the high-precision optical calibration technology for large-range distance measurement realized by the invention is a linear system and is not influenced by the nonlinearity of experimental devices.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. A high-accuracy, large-dynamic-range optical channel attenuation detection system, comprising: the device comprises a first optical power acquisition module, a second optical power acquisition module and an optical power attenuation detection module;
the first optical power acquisition module is used for acquiring first optical power of an optical signal;
the second optical power obtaining module is configured to obtain a second optical power of the optical signal;
the optical power attenuation detection module is respectively connected with the first optical power acquisition module and the second optical power acquisition module, and is configured to perform a difference on the first optical power and the second optical power to obtain an attenuation result.
2. A high accuracy high dynamic range optical channel fading detection system as in claim 1,
the first optical power acquisition module comprises a multi-wavelength laser group, an optical channel transmission unit and a photoelectric detector;
the multi-wavelength laser group is used for generating and transmitting optical signals;
the optical channel transmission unit is used for receiving the optical signal and outputting the optical signal to the photoelectric detector through an optical channel;
the photodetector is connected to the optical channel transmission unit, and is configured to receive the optical signal output by the optical channel transmission unit, and obtain a first optical power of the optical signal.
3. A high accuracy high dynamic range optical channel fading detection system as in claim 1,
the second optical power acquisition module comprises a multi-wavelength laser group and a photoelectric detector;
the multi-wavelength laser group is used for generating and transmitting optical signals;
the photoelectric detector is connected with the multi-wavelength laser group and used for receiving the optical signals output by the multi-wavelength laser group and obtaining second optical power of the optical signals.
4. A high accuracy high dynamic range optical channel attenuation detection system according to claim 2 or 3,
the multi-wavelength laser group comprises a plurality of lasers corresponding to different wavelengths and is used for selectively starting the lasers corresponding to the wavelengths in the multi-wavelength laser group according to different requirements of different optical channels on transmission optical wavelengths to generate and transmit optical signals.
5. A high accuracy high dynamic range optical channel fading detection system as in claim 1,
the optical channel attenuation detection system also comprises a photocurrent acquisition module, a signal processing module and a bias voltage self-adaptive adjustment module;
the photoelectric current acquisition module is connected with the photoelectric detector and used for acquiring photoelectric current generated after the photoelectric detector receives a light signal and transmitting the photoelectric current to the signal processing module;
the signal processing module is connected with the photocurrent acquisition module and used for receiving the photocurrent and sending different instructions to the bias voltage self-adaptive adjustment module according to the magnitude of the photocurrent;
the bias voltage self-adaptive adjusting module is connected with the signal processing module and used for adjusting the bias voltage of the photoelectric detector according to different instructions sent by the signal processing module.
6. A high accuracy high dynamic range optical channel fading detection system as in claim 5,
the signal processing module comprises a signal intensity judging unit, and the signal intensity judging unit is used for controlling the bias voltage self-adaptive module to output a high-voltage gating signal by setting a signal intensity threshold value when a signal received by the signal processing module is smaller than the signal intensity threshold value, so that the photoelectric detector works in a single photon counting mode to detect a light signal with weak power; when the signal received by the signal processing module is greater than the signal intensity threshold, the bias voltage self-adaptive module is controlled to output a direct current bias signal, so that the photoelectric detector works in a linear mode to detect a strong-power optical signal.
7. A high-precision large-dynamic-range optical channel attenuation detection method is characterized by comprising the following steps of,
selecting and starting a laser with a corresponding wavelength in the multi-wavelength laser group according to the characteristics of a channel to be measured, and generating and transmitting a light signal;
directly accessing the optical signal to a photoelectric detector to obtain first optical power of the optical signal; the optical signal is accessed to an optical channel to be measured, and then is accessed to a photoelectric detector after being transmitted by the optical channel, so that second optical power of the optical signal after being transmitted by the optical channel is obtained;
and obtaining the attenuation result of the optical channel to be measured by making a difference value between the first optical power and the second optical power.
8. A high accuracy high dynamic range optical channel fading detection method as defined in claim 7,
the method comprises the steps that the optical signal is connected to an optical channel to be measured, the optical signal is connected to a photoelectric detector after being transmitted through the optical channel, and in the process of obtaining the second optical power of the optical signal after being transmitted through the optical channel, the photoelectric signal generated after the photoelectric detector receives the optical signal is transmitted to a signal processing module through a photoelectric current acquisition module, and the signal processing module sends different instructions to a bias voltage self-adaptive module according to the size of the received photoelectric signal to adjust the bias voltage of the photoelectric detector.
9. A high accuracy high dynamic range optical channel fading detection method as defined in claim 8,
the process that the signal processing module sends different instructions to the bias voltage self-adaptive module to adjust the bias voltage of the photoelectric detector according to the magnitude of received light current comprises the steps that a signal intensity threshold value is set through a signal intensity judging unit of the signal processing module, and when a signal received by the signal processing module is smaller than the signal intensity threshold value, the bias voltage self-adaptive module is controlled to output a high-voltage gate control signal, so that the photoelectric detector works in a single photon counting mode to detect light signals with weak power; when the signal received by the signal processing module is greater than the signal intensity threshold, the bias voltage self-adaptive module is controlled to output a direct current bias signal, so that the photoelectric detector works in a linear mode to detect a strong-power optical signal.
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| WO2008121072A1 (en) * | 2007-04-02 | 2008-10-09 | Bo Cederwall | System and method for photon detection |
| CN102244538A (en) * | 2010-05-10 | 2011-11-16 | 华为技术有限公司 | System and method for detecting sub-optical fibers, ODN (optical distribution network) and optical splitter |
| US20160337034A1 (en) * | 2015-01-28 | 2016-11-17 | Exfo Inc. | Method and system for measuring an optical power attenuation value of a multimode device under test, receive device and computer-readable memory |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008121072A1 (en) * | 2007-04-02 | 2008-10-09 | Bo Cederwall | System and method for photon detection |
| CN102244538A (en) * | 2010-05-10 | 2011-11-16 | 华为技术有限公司 | System and method for detecting sub-optical fibers, ODN (optical distribution network) and optical splitter |
| US20160337034A1 (en) * | 2015-01-28 | 2016-11-17 | Exfo Inc. | Method and system for measuring an optical power attenuation value of a multimode device under test, receive device and computer-readable memory |
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